$ZnO-Pr_{6}O_{11}-CoO-Cr_{2}O_{3}-La_{2}O_{3}$계 바리스터의 전기적 특성에 소결 온도의 영향

Influence of Sintering Temperature on Electrical Properties of $ZnO-Pr_{6}O_{11}-CoO-Cr_{2}O_{3}-La_{2}O_{3}$ Based Varistors

  • 류정선 (동의대학교 전기공학과) ;
  • 김향숙 (동의대학교 전기공학과) ;
  • 남춘우 (동의대학교 전기공학과)
  • 발행 : 2001.11.01

초록

The electrical properties of ZnO-Pr$_{6}$O$_{11}$-CoO-Cr$_2$O$_3$-La$_2$O$_3$ based varistors were investigated with sintering temperature in the range of 1240~130$0^{\circ}C$. The varistors sintered at 1240~126$0^{\circ}C$ exhibited high density, which was 5.50~5.70 g/㎤ corresponding to 95.2~98.6% of theoretical density The varistor voltage was decreased in range of 718.47~108.00 V/mm with increasing sintering temperature. The varistors sintered at 1240~126$0^{\circ}C$ exhibited good electrical properties, in which the nonlinear exponent is in the range of 79.25~49.22 and leakage current is in the range of 0.26~1.00 $\mu$A. In particular, the varistor sintered at 1240\`c showed very excellent electrical properties, in which the nonlinear exponent is 79.25 and leakage current is 0.26 $\mu$A.A.A.

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